Terahertz-bandwidth photonic fractional Hilbert transformer based on a phase-shifted waveguide Bragg grating on silicon
Publication Type:Journal Article
Source:Optics Letters, OSA, Volume 39, Number 21, p.6241--6244 (2014)
Keywords:Integrated optics devices; Pulse shaping; Pulses; Ultrafast devices; Ultrafast processing
We propose and experimentally demonstrate the first THz bandwidth on-chip photonic fractional Hilbert transformer. The reported design uses a novel approach, based on a uniform and nonapodized single phase-shifted integrated waveguide Bragg grating on silicon, where the fractional order P can be engineered by simply varying the effective index modulation \&\#x3B4;n. Experimental results for P$=$1.5 show very low processing error for a broad range of pulse bandwidths between 77\&\#xA0;GHz and 2.07\&\#xA0;THz, corresponding to a time-bandwidth product as high as 27.